Thread-tensioning means for shuttles



Oct. 9, 1928. 1,687,320

L. A. CADORET THREAD TENSIONING MEANS FOR SHUTTLES Filed Aug. 11, 192'? 2 Sheets-Sheet 1 Q.Wu a:

anoouup Oct. 9, 1928.

1. A. CADORET THREAD TENSIONING MEANS FOR SHUTTLES Filed Aug. 11, 1927 2 Sheets-Shet shown and while Patented Oct. 9, 1928 UNITED STATES T OFFICE.

LOUIS ALEXANDRE CADQRET, OF PAVTUCKET, -RHODE ISLAND.

THREAD-TENSIONING MEANS FOR SHUTTLES.

Application filed August 11, 1927. Serial No. 212,254.

The inventionrelates to improvements in thread tensioning devices for loom shuttles, and. it is intended primarily for use with shuttles which are automatically changed and threaded. The present disclosure of the invention is designed for use in connection with automatic shuttle threaders such as those shown in my U. S. PatentsNos. 1,542,214 of June 16, 1925, and 1,569,712 of January 12,

One object of the invention is to provide an exceptionally simple and inexpensive, yet an efficient and reliable self-adjusting tensioning device disposed at the eye of the IS shuttle and of such nature as to maintain the proper tension upon the filling or thread, so as to prevent such difliculties as doubles, shiners, and broken picks. i

' Another object is to provide a construction which is well adapted for use with the automatic threaders shown by the patents above referred to, particularly the threader of the later Patent 1,569,712.

With the foregoing in view, the invention resides in the novel subject matter hereinafter described and claimed, the description being supplemented by the accompanying drawings.

Fig. 1 is a fragmentary top plan vlew of 90 a shuttle equipped with the invention.

Fig. 2 is a longitudinal sectional view through the shuttle showing the threadguiding and tensioning meansin side elevatlon.

Fig. 3 is-a top plan viewof the threader and the tension device shownin Figs. 1 and 2. Fig. l is an enlarged side elevationof the parts shown in Fig. 3. V

Fig. ,5 is a longitudinal section on line 5-5 of Fig. 3.

Figs. 6 and 7 are transverse sectional views on the correspondingly numbered lines of Fig. 5. I

Figs. 8 and?) are perspective views showing the thread guiding member and the tensioning member separated from each other.

Fig. 10 isa perspective viewiof' the threader and the otensioning device, showing a slightly different form of the latter.

In the drawingsabove briefly described, preferred features of construction have been such features will be herein specifically explained, it is tobe understood that within the scope of the invention as claimed, numerous variations may lie made.

The numeral 1 denotes a common form of shuttle having the usual longitudinal opening 2 for the thread carrying bobbin 3. The shuttle is recessed at 4 at one end of the opening 2 and a thread-guiding groove 5,.is formed inv the upper side of said shuttle from the recess 4 to the adjacent shuttle end, this groove coming into play onl while the shuttle is being threaded. 5 enotes the usual slit or the like leadin'g'to the eye of the shuttle (not shown).

Secured in the lower portion of the recess 4 is an elongated base plate 6 which is preferably of the general construction'disclosed in Patent 1,569,712 above mentioned. This base is provided with an upstanding ear 7 at the inner end of one of its longitudinaledges, said ear having an opening 8 through which a transverse pin 9 passes to anchor the base in the recess 4;, said pin overlying the base and. passing through suitable openings in the shuttle 1.

Over the base 6, is a thread-guiding member M which is formed of a single piece of wire. One end of'thiswireis secured to the base 6 and extends in a subst'antiall vertical direction therefrom to provide a t readguiding leg 10', the wire at thev upper end of this leg being coiled at 11 to provide a scroll-like eye which is disposed in a vertical plane transverse to the base 6. From the eye 11, the wire is extended to provide an arm 12 which is substantially horizontal and is preferably disposed at about right angles to the plane of said eye. At the end of this arm remote from the eye 11, the wire is bent substantially. upon itself as indicated at 13, the

wire preferably extending horizontally over a-portion of the arm 12 as indicated at 14, and then. declining to provide a second relatively short arm '15. In addition to declining from the arm 12, the arm 15 diverges laterally from a verticalplane in which said arm 12 'lies,the lower extremity of said arm 15 being secured to the base 6, providing a second thread-guiding leg 16 which is spaced from the leg 10 and is disposed at the inner end of the shuttle eye.

The thread-guidingmember M is substantially the same as that shown in the two patents above mentioned, and while the legs 10-16 could of course be anchored to the base 6 in any desired manner, the method of anchorage shown in Patent1,569,712 is preferably employed. j I A thread-tensioning arm 17 is disposed longitudinally over the plate 6 either at the inner side of the leg 16 (Figs. 1 to 9) or at the outer side of said leg (Fig. 10) The inner end of this arm 17 is loosely pivoted to the ear 7 by a transverse horizontal pivot 18, permitting vertical swinging of said arm under the influence of the thread or filling 'I which filling engages the inner sides of the legs 10 and 16 and passes under said arm as it extends to the shuttle eye. The outer end of arm 17 is extended upwardly at 19 and is provided with a vertically elongated guide loop 20 which loosely embraces the arm 12 of the member M, holding said arm 17 against excessive lateral play, regardless of the looseness of the pivot of said arm, necessary to allow free vertical play of this arm.

In the preferred construction, the arm 17 is formed 01": a single length of wire bent to provide the formations 1920 at one end and at its other end bentto form an eye 21 through which the pivot 18 passes, said pivot being usually in the form of a rivet.

By preference, a cover C is used with the parts above described, said cover being of the term shown in Patent 1,569,712, above reierred to; This cover embodies a top plate 22 which overlies the thread-guiding and tensioning parts and serves to limit the upward swinging of arm 17.

The thread '1 reaches the position shown in Figs. 3, 4 and 10, in the same manner as in the two patents to which I have previously referred. In such position, the thread is trictionally engaged with the loosely pivoted arm 17 and the base- 6, thus providing for effective tensioning and overcoming a great many diiiiculties well known to those skilled in the art, such as doubles, broken picks and shiners. .As the arm 17 is loosely mounted, it can freely move upwardly under the influence of the thread T, but by. means of gravity it is self-lowered as conditions require. Thus, it constitutes an efiective selfadjusting tensioning device which is mounted at the eye of the shuttle and hence is unusually eiiicient.

In the form or the device shown in Fig. 10, the structure and arrangement of the parts is exactly the same as shown in the other views except that the thread tensioning arm 17 is disposed at the outer side of the leg 16 instead of at the inner side and this arm 17 acts on the thread in this form of the device in the same manner as in the form shown in arnidisposed over the base, means pivotally mounting said arm for vertical swinging, and means carried by said arm and loosely engaged with'said portion of said threader for guiding the vertical movement ofthe arm.

2. In combination with a shuttle threader having a base and asubstantially horizontal.

portion spaced above said base; a thread-ten sioning arm disposed over the base, means pivotally mounting one end of sa d armon the base to permit vertical swinging ot'said arm, the other end of said arm beingextended upwardly, and a vertically elongatedguide carried by said upwardly extended arm end, said guide loosely engaging the aforesaid substantially horizontal portion of the threader.

3. In combination with a shuttle threader having a base, a substantially vertical threadguidmg portion rising trom said base and a substantially horizontal portion spaced above said base; a tliread-tensioning arm disposed over the base at one side of said vertical portion of the threader, means at one end of said arm pivotally connecting it with the base, and

means at the other end of said arm loosely en-- i gaged with said substantially horizontal portion of the threader for guiding the vertical movement of the arm. a

4. In combination with a shuttle threader having a base, a substantially vertical threadguiding portion rising from said base anda substantially horizontal portion spacedabovc said base; a thread-tensioning arm disposed over said base at one side of said vertical POI'. tion of the threader, means pivoting oneend of said arm to the base and permitting vertical swinging of said arm, the other end of said arm being upwardly extended, and a vertical ly elongated guide on said upwardly extended arm end,'said guide being loosely engaged with said horizontal portion of the threader.

5, In combination with a shuttle threader having a base, and an ear rising from 7. In combination with a shuttle threader having a base, anear projecting upwardly from said base, a substantially vertical threadguiding portion rising from the base in spaced relation with the ear, and a substantially horizontal portion spaced above said base; a thread-tensioning arm disposed over the base at one side of said vertical portion of the threader, means loosely pivotingone end of said armto said ear, the other end of said arm being extended upwardly, and a vertically elongated guide carried by said upwardly extended arm "end, said guide being loosely engaged with saidhorizontal portion of the threader.

5 guide means.

8. A thread-tensioning device comprising which it may be pivotally mounted, the other an arm provided at one end with. means Whereend of said arm being bent upwardly and then by it may be pivotally supported, the'other downwardly to provide guide means for said 10 end of said arm being provided with vertical arm. Y

i In testimony whereof I have hereunto'af- 9. A thread-tensioning device comprising fixed my signature. I an arm having means at one end by means of LOUIS ALEXANDRE CADORET. 

